Susan and betsy bought sport supplies for summer camp. susan bought six basketballs and one soccer ball for $27. betsy bought four basketballs and two soccer balls for $22. how much do basketballs cost? how much do soccer balls cost?

For this case, the first thing we must do is define variables:
 x: cost of each basketball
 y: cost of each soccer ball
 We now write the system of equations:
 6x + y = 27
 4x + 2y = 22
 Solving the system we have:
 x = 4 $
 y = 3 $
 
 basketballs cost $ 4
 soccer balls cost $ 3

The answer is -pie over 2